A method for forming a hole by using a bundled impact slurry carrier to protect the wall

Abstract

The present invention relates to a method for forming a hole with a bundled impact mud carrier, which belongs to a method for forming a pile hole. The technical scheme of the present invention comprises the following steps: using a bundled impact pile driver to perform impact embedding at the pile position, injecting mud into the impacted pile hole, mixing the crushed stone slag and soil blocks generated by the impact of the bundled impact pile driver into the mud, and pumping or discharging the pile hole from the bottom to the top with the mud, the mud precipitates the crushed stone slag and soil blocks in the sedimentation tank outside the pile hole, and then injects it into the pile hole again, and the mud brings the crushed stone slag and soil blocks out of the pile hole during the circulation, and the impactor on the rotating rod head of the bundled impact pile driver is a combination of multiple small-diameter impactors, and the rotation of the drill rod drives the multiple impactors to revolve, thereby completing the impact work of a large area of ​​the circular pile hole. The advantages of the present invention are: in the pile hole impact construction using pneumatic impact technology, the stone slag and soil blocks generated by the impact are driven to be discharged through the positive and reverse circulation of the mud, which is suitable for the construction of pile holes with deeper and larger diameters; through pneumatic impact hole formation and mud conduction, compared with other hole formation technologies, the hole formation speed and quality are effectively improved.

Description

Technical Field

[0001] The invention relates to a wall protection hole forming method using a bundled impact mud carrier, belonging to a pile hole construction method. Background Art

[0002] There are several ways and disadvantages of traditional foundation pile driving. One is drilling with a rotary drilling machine. In rotary drilling, mud wall protection is required for landslides, sand layers, and rock layers. It cannot operate continuously, and its efficiency in rock crushing and core extraction is not high. Positive and reverse circulation drilling: Positive circulation drilling has extremely low efficiency in rock formations. Reverse circulation drilling is a clean water pile driver without mud wall protection. Therefore, it cannot work in sand layers, landslide layers, and rock layers. Manual impact hammer pile driver drilling is suitable for various terrains, but its impact frequency is low. Therefore, the working efficiency is low; the down-the-hole hammer pile driver drills holes, and the down-the-hole hammer relies on air pressure impact to drill holes, which is only suitable for small-diameter drilling. The reason is that the slag and powder caused by the impact are discharged by wind flow to form holes. The air flow rate of large-diameter pile holes is insufficient during impact, because the air inlet channel is the drill rod, and the slag exhaust channel is the diameter of the pile. The proportion is too large, and the slag and stone powder generated by the impact cannot be carried out of the pile mouth ground with the wind speed, but fall back to the impact surface layer, causing too much dust and slag, which makes the impactor unable to work.

[0003] The above-mentioned various existing pile driving and hole-forming technologies each have many problems and are only suitable for ordinary hole-forming requirements. They are not effective for continuous hole-forming operations and large hole sizes. Summary of the invention

[0004] The invention provides a wall protection hole forming method with a bundled impact slurry carrier, which solves the problem of slag discharge of crushed stone slag and crushed soil blocks in the hole forming technology of a down-the-hole hammer pile machine and realizes continuous impact slag discharge.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The invention relates to a wall protection and hole forming method using a bound impact pile driver. A bound impact pile driver is used to perform impact embedding at a pile position. Mud is injected into the impacted pile hole. Crushed stone and soil blocks generated by the impact of the bound impact pile driver are mixed into the mud and are pumped or discharged from the pile hole from the bottom to the top with the mud. The mud settles the crushed stone and soil blocks in a sedimentation tank outside the pile hole and is then injected into the pile hole again. The mud brings the crushed stone and soil blocks out of the pile hole during circulation. The impactor on the rotating rod head of the bound impact pile driver is a combination of multiple small-diameter impactors. The rotation of the drill rod drives the multiple impactors to revolve, thereby completing the impact work of a large area of ​​the circular pile hole.

[0007] Preferably, the mud is circulated between the pile hole and the external mud pool by a positive circulation method. A mud conduit is arranged in the pile hole between the rotating head of the aggregate impact pile driver and the impactor. A slurry outlet is left from the mud conduit to the impact surface. The mud conduit is connected to a mud pump. The mud pump draws mud that has precipitated crushed stone and soil blocks from the mud pool, and injects it into the impact surface at the bottom of the pile hole again through the mud conduit. The mud carries crushed stone and soil blocks and flows out of the pile hole at the pile hole mouth. The mud flowing out of the pile hole is processed by precipitating crushed stone and soil blocks. This process is a positive circulation.

[0008] Preferably, when the mud is circulated between the pile hole and the external mud pool by the reverse circulation method, a mud conduit is arranged in the pile hole between the rotating head of the aggregate impact pile driver and the impactor, a slurry inlet is left from the mud conduit to the impact surface, the mud conduit is connected to the mud pump, the mud pump extracts the mud containing crushed stone and soil blocks, and discharges it into the sedimentation tank for sedimentation of the crushed stone and soil blocks, and the precipitated mud flows into the pile hole at the pile hole mouth and into the bottom of the pile hole, so as to circulate in this way, which is the reverse circulation.

[0009] Preferably, a mud pool and a sedimentation tank are excavated around the impact position of the pile hole, a connecting ditch is excavated between the mud pool and the sedimentation tank, and a mud return ditch is excavated between the pile hole position and the sedimentation tank.

[0010] Preferably, the bundled impact pile driver is provided with a drill rod, a bracket, a lifting mechanism, a rotating structure and a gas distribution mechanism.

[0011] Preferably, the gas distribution mechanism is an air compressor and a gas pressure tank. The air compressor compresses the air into the gas pressure tank, and the gas pressure tank passes the high-pressure gas into the impactor of the integrated impact pile driver. The high-pressure gas drives the impactor to impact the soil layer or rock layer for impact construction. During the impact process, the drill rod and the impactor rotate synchronously.

[0012] Preferably, when the mud is circulating, the mud level in the pile hole is higher than the mud level in the sedimentation tank. After the sedimentation tank receives the inflowing mud, large particles of soil and slag are precipitated in the sedimentation tank, and the surface mud flows into the mud tank after precipitation.

[0013] Preferably, in the mud reverse circulation, the mud level in the pile hole is lower than the mud level in the mud pool, the sedimentation tank receives the mud pumped out by the mud pump, and the large particles of soil and slag in the mud are precipitated in the sedimentation tank. After precipitation, the surface mud flows into the mud pool and then into the pile hole.

[0014] Preferably, for different rock and soil layers, the flow rate, specific gravity and composition of the mud are adjusted so that it can suspend the crushed stone, residue and soil produced by the impact, and then be pumped or discharged from the pile hole into the sedimentation tank for sedimentation through mud circulation.

[0015] The advantages of the present invention are: using pneumatic bundled impact hole-forming technology, and using the positive and reverse circulation of mud to remove the crushed stone slag and crushed soil produced by the impact, so as to adapt to the impact construction of pile holes with deeper depth and larger diameter; using pneumatic bundled impact hole-forming technology, the construction efficiency is high compared with the existing hole-forming technology in the background technology, and the hole-forming speed and hole-forming quality are improved;

[0016] The mud is circulated and injected into the pile hole, which can bring out the broken stones, rocks and soil produced by the impact for sedimentation treatment, and the treated mud can be recycled.

[0017] The invention has a fast impact hole-forming speed, can work continuously, and is suitable for various strata.

[0018] The present invention adopts the technology of wall protection and hole-forming by using a bundled impact mud carrier to solve the shortcomings and deficiencies of many pile drivers in the background technology, and has the advantages of fast hole-forming speed and adaptability to various strata. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 These are the steps of the wall protection and hole forming method using a bundled impact mud carrier according to the present invention. DETAILED DESCRIPTION

[0020] The specific contents of the present invention are further described below:

[0021] The method of the present invention adopts a method of construction using a bundled impact pile driver combined with mud wall protection. Its working method is: the bundled impact pile driver performs a bundled impact on the pile hole to achieve the purpose of quickly crushing stones, breaking rocks and crushing soil. At the same time, the positive or reverse circulation mud is used as a carrier to carry out the crushed stones, residues and crushed soil produced by the impact, and the mud circulation conduction is used to carry them out, so that the impact surface layer is cleaned in time for the impactor, thereby ensuring the normal impact work of the impactor. The impact hole forming speed of the present invention is fast, it can work continuously, and it is suitable for various strata.

[0022] Taking the positive circulation of mud as an example, the specific steps of the method of wall protection and hole forming by the bundled impact mud carrier are explained:

[0023] S10: digging a mud pool and a sedimentation pool around the pile hole excavation position, digging a connecting ditch between the mud pool and the sedimentation pool, and digging a mud return ditch between the pile hole position and the sedimentation pool;

[0024] S20: Position the pile driver at the pile position, and connect the high-pressure gas pipeline between the pile driver and the high-pressure gas source;

[0025] S30: A mud conduit is connected between the mud pump and the rotating head and the impactor of the bundled impact pile driver. The mud is injected into the mud conduit and flows out at the impact surface. The mud flows upward from the impact surface of the pile hole, flows out of the pile hole and flows into the sedimentation tank through the mud return ditch. The mud composition, flow rate and specific gravity are adjusted according to the properties of the soil layer or rock layer in the pile hole so that it can suspend the crushed stone residue and soil produced by the impact, so as to adapt to the crushed stone residue or soil layer produced by the impact of various strata or rock layers, and is brought out of the pile hole through circulation and enters the sedimentation tank for sedimentation.

[0026] S40: In order to meet the requirements of mud recycling, the mud height in the pile hole needs to be higher than the mud height in the sedimentation tank. After the sedimentation tank receives the mud flowing in from the return ditch, large particles of soil and stones are precipitated in the sedimentation tank. After precipitation, the surface mud flows into the mud pool through the connecting ditch.

[0027] S50: Use a bundled impact pile driver to perform impact construction at the pile position. The high-pressure gas source is distributed to the impactor at the end of the rotating rod through a high-pressure gas pipeline according to the air flow and air pressure matched by the impactor of the bundled impact pile driver. The impactor performs impact work on the pile hole.

[0028] S60: Repeat S30-50 until a pile hole of required depth is punched out.

[0029] In the hole-forming method of the present invention, a bundled impact pile driver is used. The bundled impact pile driver is a new type of pile hole forming equipment. The impactor on the drill rod head has multiple small-diameter impactors combined together to achieve the required diameter of the pile hole (called a bundled impactor). The rotation of the drill rod drives the impactor to revolve, thereby completing the impact work of a large area of ​​the circular pile hole.

[0030] The bundled impact pile driver is also equipped with a drill rod, a bracket, a lifting mechanism, a rotating structure and a gas distribution mechanism. The bracket is provided with a guide rail for guiding the movement of the drill rod. The lifting mechanism drives the drill rod to lift upward or drill downward, and the rotating structure drives the rotation of the drill rod and the impactor.

[0031] The impact in the bundled impact pile driver uses an air compressor as the power, so it is equipped with an air compressor and a gas pressure tank (also called an energy storage tank or energy collection tank). During operation, the air compressor compresses the air into the gas pressure tank, and the gas pressure tank passes the high-pressure gas into the impactor of the bundled impact pile driver. The high-pressure gas drives the impactor to impact the soil or rock layer, and the drill rod rotates synchronously during the impact. The gas pressure tank distributes the wind flow and wind pressure matched by the clustered impactor of the bundled impact pile driver to each small-diameter impactor through the high-pressure gas channel in the center of the drill rod, so that the small impactors can perform impact work at the same time. The gas pressure tank ensures the stability and continuity of the high-pressure gas.

[0032] The operation procedures of the bundled impact pile driver during construction:

[0033] 1) The pile driver sets the pile position, connects the air duct to the air compressor, digs the mud pit and sedimentation tank, digs the circulation channel between the sedimentation tank and the pile hole, and adjusts the specific gravity and properties of the mud.

[0034] 2) The air compressor (air pump) is turned on to allow the gas to flow into the air passage of the pile driver. The pile driver is turned on at the same time, and the two machines (air compressor and pile driver) work in coordination to enter the impact drilling state.

[0035] 3) Turn on the mud pump to discharge or suck the mud with adjusted concentration into the pile hole, thereby starting the mud circulation process to work.

[0036] The positive circulation process of the mud in the method of the present invention is as follows: mud pump→the bottom of the pile hole→flowing out of the pile hole→the sedimentation tank→the mud tank→the mud pump.

[0037] The reverse circulation process of the mud in the method of the present invention is as follows: pile hole bottom→mud pump→sedimentation tank→mud tank→pile hole mouth→pile hole bottom.

[0038] In the pile hole impact construction using the pneumatic impact technology of the present invention, the crushed stone slag and soil blocks produced by the impact crushing are discharged through the positive and reverse circulation of the mud, which is suitable for pile hole construction with deeper and larger diameters; the pneumatic impact hole-forming technology has higher construction efficiency than other pile drivers, and effectively improves the hole-forming speed and quality.

[0039] The mud is poured into the pile hole in a circulation manner, which can bring out the crushed stone slag and soil blocks produced by the impact for sedimentation treatment, and the treated mud is recycled.

[0040] Mud carrier wall protection: By adjusting the mud flow rate, specific gravity and properties, it can suspend the slag and slag produced by the impact, and carry it out of the pile hole into the sedimentation tank for sedimentation through circulation, so the flowing mud is called a carrier. At the same time, the mud's own pressure can offset the gravity when the pile hole wall collapses, thereby achieving the function of hole forming and wall protection.

Claims

1. A method for forming a hole by using a bundled impact slurry carrier to protect the wall, characterized in that: A bundled impact pile driver is used to carry out impact embedding at the pile position, and mud is injected into the impacted pile hole. The crushed stone slag and soil blocks generated by the impact of the bundled impact pile driver are mixed into the mud and are pumped or discharged from the pile hole from the bottom to the top with the mud. The mud settles the crushed stone slag and soil blocks in the sedimentation tank outside the pile hole, and then is injected into the pile hole again. The mud brings the crushed stone slag and soil blocks out of the pile hole during circulation. The impactor on the rotating rod head of the bundled impact pile driver is a combination of multiple small-diameter impactors. The rotation of the drill rod drives the multiple impactors to revolve, thereby completing the impact work of a large area of ​​the circular pile hole. The mud is circulated between the pile hole and the external mud pool by a positive circulation method. A mud conduit is arranged between the rotating head of the aggregate impact pile driver and the impactor in the pile hole. A slurry outlet is left from the mud conduit to the impact surface. The mud conduit is connected to a mud pump. The mud pump extracts mud that has settled the crushed stone, slag and soil blocks from the mud pool, and injects it into the impact surface at the bottom of the pile hole again through the mud conduit. The mud carries the crushed stone, slag and soil blocks and flows out of the pile hole at the pile hole mouth. The mud flowing out of the pile hole is processed by settling the crushed stone, slag and soil blocks. This process is a positive circulation. A mud pool and a sedimentation pool are excavated around the impact position of the pile hole, a connecting ditch is excavated between the mud pool and the sedimentation pool, and a mud return ditch is excavated between the pile hole position and the sedimentation pool; When the mud is circulating positively, the mud level in the pile hole is higher than the mud level in the sedimentation tank. After the sedimentation tank receives the inflowing mud, large particles of soil and slag are precipitated in the sedimentation tank. After precipitation, the surface mud flows into the mud tank. According to different rock and soil layers, the mud flow rate, specific gravity and composition are adjusted to suspend the crushed stone, residue and soil produced by the impact, and then the mud is pumped or discharged from the pile hole into the sedimentation tank for sedimentation through mud circulation.

2. The method for forming a hole by using a bundled impact slurry carrier to protect the wall according to claim 1, characterized in that: When the mud is circulated between the pile hole and the external mud pool by the reverse circulation method, a mud conduit is arranged in the pile hole between the rotating head of the aggregate impact pile driver and the impactor. The mud conduit leaves a slurry inlet to the impact surface. The mud conduit is connected to a mud pump. The mud pump extracts mud containing crushed stone and soil blocks and discharges it into a sedimentation tank for sedimentation of the crushed stone and soil blocks. The precipitated mud flows into the pile hole at the pile hole mouth and then into the bottom of the pile hole. This cycle is called reverse circulation.

3. The method for forming a hole by using a bundled impact slurry carrier to protect the wall according to claim 1, characterized in that: The bundled impact pile driver is equipped with a drill rod, a bracket, a lifting mechanism, a rotating structure and a gas distribution mechanism.

4. The method for forming a hole by using a bundled impact slurry carrier to protect the wall according to claim 3, characterized in that: The gas distribution mechanism is an air compressor and a gas pressure tank. The air compressor compresses the air into the gas pressure tank, and the gas pressure tank passes the high-pressure gas into the impactor of the integrated impact pile driver. The high-pressure gas drives the impactor to impact the soil layer or rock layer to perform impact work. During the impact process, the drill rod and the impactor rotate synchronously.

5. The method for forming a hole by using a bundled impact slurry carrier to protect the wall according to claim 2, characterized in that: During the mud reverse circulation, the mud level in the pile hole is lower than the mud level in the mud pool. The sedimentation tank receives the mud pumped out by the mud pump. The large particles of soil and slag in the mud settle in the sedimentation tank. After sedimentation, the surface mud flows into the mud pool and then into the pile hole.

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